Anolis OS update for unbound

1) Resource exhaustion

EUVDB-ID: #VU69407

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-3204

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing a malicious delegation with a considerable number of non responsive nameservers. A remote attacker can trigger CPU high usage and perform a denial of service (DoS) attack.

The attack is known as "Non-Responsive Delegation Attack" (NRDelegation Attack).

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

unbound-libs: before 1.16.2-3

unbound-devel: before 1.16.2-3

unbound: before 1.16.2-3

python3-unbound: before 1.16.2-3

CPE2.3

• cpe:2.3:o:openanolis:anolis_os:8:*:*:*:*:*:*:*
• cpe:2.3:a:openanolis:unbound-libs:*:*:*:*:*:anolis_os:*:*
• cpe:2.3:a:openanolis:unbound-devel:*:*:*:*:*:anolis_os:*:*
• cpe:2.3:a:openanolis:unbound:*:*:*:*:*:anolis_os:*:*
• cpe:2.3:a:openanolis:python3-unbound:*:*:*:*:*:anolis_os:*:*

External links

https://anas.openanolis.cn/errata/detail/ANSA-2023:0408

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.